Daikin RXYQ96PYDN Service Manual page 364

SiUS34-801A_b
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Electronic
expansion valve
is connected to X7A of
indoor unit PC
board.
YES
Coil check
(∗1) of electronic
expansion valve drive
indicates
normal.
YES
Relay
cables short circuit or
disconnected.
NO
∗1: How to check the coil of electronic expansion valve drive
Remove the connector for electronic expansion valve (X7A) from PC board. Measure the resistance
value between pins and check the continuity to judge the condition.
White (1)
φ1
M
Red (5)
φ3
Orange (3)
φ2 φ4
Yellow Brown Blue
(2) (6)
The normal products will show the following conditions:
No continuity between (1) and (2)
Resistance value between (1) and (3) is approx. 300 Ω
Resistance value between (1) and (5) is approx. 150 Ω
Resistance value between (2) and (4) is approx. 300 Ω
Resistance value between (2) and (6) is approx. 150 Ω
Troubleshooting by Indication on the Remote Controller
NO
NO
YES
1) White
2) Yellow
3) Orange
4) Blue
5) Red
(4)
6) Brown
Shut the power supply off after
connection and then restart.
Replace coil of electronic
expansion valve.
Replace relay cables.
When restarting the operation
after shutting the power supply off
does not work, replace indoor unit
PC board.
349